Thermostatic control device for heating chambers



G. W. COLLIN.

THERMOSTATIO CONTROL OEvlOE FOR HEATING CHAMBERS.

APPLlCATION FILED 0CT.11919.

Patented Mar. 2R, E922.'

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@Horn Ms G. w. COLLIN. THERMOSTATTC CONTROL DEVICE FOR HEATING CHAMBERS.I APPLICATION EILED OCT. 1-,. 1919. l,@l@@58 Y' Patented Mar. 28, 1922.

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GEORGE W. COLLIN, 0F BRIDG-EPORT, CONNECTICUT.

' THERMOSTATIC CONTROL DEVICE FOR HEATNG CHAMBRS.

arroces.

Specicaton of I etters Patent'.

Patented Mar. 28, E922..

Application filed October 1, 1919. Serial'No. 327,734.

To all Iwho/m t may concern.'

Be it known vthat l, GEORGE W. COLLIN, a citizen of the United States,and resident of Bridgeport, in the county of Fairfield and State ofConnecticut, have ,invented certain new and useful Improvements inThermostatic Control Dvices for Heating Chambers, tion. l

My invention relates to new and useful improvements in .thermostaticcontrol devices for steam supplied to steam chambers ther comprisesmeans for adjusting and rege through heating pipes, coils or the like,and particularly relates' to means for 'controlling said supply at adistant peint bythe rise and fall of the temperature in the steam cham'-ber. Theinvention also' comprises a novel form of thermostatic controldevice including a control valve operated through athermostatic couplewhich is directly exposed to the steam chamber .and theinvention'furulating the control valve-.mechanismwhereby the eil'ect ofthe thermostat may .operate thevalve at different degrees of heat asrequired,

The objectof the inventionis to provide av reliable, simple andeflicient form of thermostatic control device which may be applied to aheating chamber, suc-h for instance as a heat treating chamber, wherecertain degrees of" heat are required tofbe ing pipes and the like, andis an improve' ment thereon in that I use a different design of controlvalve having a thermostatic couple for operating the same together withan ad- Y justable device whereby the action of the control valve may beeffected at vario-us degrees of heat. The invention further comprisesadditional features of advantage which will'later be pointed out in thespecilications and 'claims here to follow.

of which the following is a specifica- Ymounted on a modied form of kberdesigned to be positioned upon the outside of y Figr 4 is a sectionalelevation of the con- My invention will be better understood withreference to the accompanying drawings which l will now proceed todescribe and invwhich my invention is shown applied in two diferentmanners, adapting it to different conditions and upon these drawings,corresponding reference characters will befound to designate like orcorresponding partsh throughout the several figures and of Fig. l showsaside view of an inlet valve positioned in a main steam ysupply pipe,and connected by a'small pipe with my improved thermostatic controldevice, and including 1n part, a pilot valve positioned in the steamchamber, for operating the main inlet valve.

F ig. 2 shows an enlarged central vertical sectional view through thepilot valve shown in Fig. l. r y lilig. 3 shows' a side view oftherpilot valve,

steam chamthe main steam chamber, and

right thereof.

My invention is adapted for various purposes and consequently applicableto different styles and sizes of steam chambers, therefore we have shownin the drawings, a very simple form of construction illustrating thesame. Sofar the application to practice of invention has been limited toheat treating chambers wherein the materialsto be treated structlonshown in Fig. 3, asseen from the yarepositioned in the heat chamberl andthen the steam turned on and its temperature automaticallyv regulatedfor a givenlengthV of time. In steam chambers of this sort where theconstruction of the chamber and the condition of the work will permit lapply a thermostatic valve control device directly to the body of thechamber with part of the apparatus extending therein. In other forms ofheating chambers where the thermostat would be in the way, it would bepositioned in a small auxilia chamber that is connected =with the mainheating. chamber. The construction of the i operative parts of theinvention is the same in both instances.

v Referring in detail to the characters of reference marked upon thedrawings, 6 represents the steam inlet pipe which in practice would` beconnected with a source of supply, not shown, to the steam chamber 7. 8represents a steam inlet diaphragm valve, somevsigned to operate in thesame manner.

my said prior patent application and portion having an inlet and outletto which the said pipe 6 is connellted, in a manner to pass the steamthroughvtlle valve and body when the latter is opened to admit of thepassage of steam. A valve 9 is positioned in the body'and carries avalve stein 10 upon which a spring 11 is mounted. This valve is nor-lmally held down, to close the passage through the valve body, by thespring, one Aend of which is seated against the valve. The outer edgeportion o f the diaphragm 12 is clamped between'the upper anged portionof the body and the lcovering plate 13. This diaphragm has its centralportion secured to the valve stem by being clamped, between the plates14 and /15 and secured to the valve stem by a nut 16. This constructionthus forms a steam chamber 17 above the diaphragm that is connected withthe control valve through a pipe 18 and through whichn the pressure -isbuilt up or relieved in said chamber by the action kof the pilot valve.

l The valve stem 10 is provided with a conduit 19 which connects the'upper chamber 17 above the diaphragm with the chamber 20 in the valvebody, surrounding the valve clapper 9 on the live steam side of thevalvej` sol as topermitof a very small amount of steam passing throughfrom the live steam side of the valve to the pressure chamber 17 abovethe diaphragm which serves to normally equalize thepressure on the twosides ofthe diaphragm untilothe same is released through the abovementioned connecting pipe 18.

The steam chamber 7 shown in Fig.i 1' is provided with an opening 21,that is preferably located in its upper rear end portion,

" and. into which a sleeve 22 is positioned from the inside. The lowerportion of the sleeve is provided with a flange 23 that fits against theinner wall of the receptacle and is provided with a gasket 24 to sealthe connection.

v A bracket 25 having a central hole to receivey the sleeve ispositioned upon the top side of the wall of the receptacle, and isprovided with two extended end portions 26 and 27 to which other membersof `the device, later ,to

"be described are `pivotally connected. The

periphery of the upper end portion ofzthe sleeve is threaded to receivethe clamping nut 30 which clamps the saidbracket in position as well asthe sleeve 22 to the wall of the steam chamber. This sleeve is providedwith a central longitudinal bore to accommodate' an adjustable tubularpost 28 carried therein. j

The post 28-is frictionally heldin the hollow sleeve by a packing 29that is clamped between the top end of the sleeve and a nut 30 that ispreferably slippedon the post before the same is positioned in thesleeve. This lnally by the adjusti device later to be de scribed. Adetachab ef extension 31 having 1 therein a valve chamber 32 and a valveseat 33, is threadablyl secured to the lower end of the post. rThe valvechamber in this extensio i connects with the longitudinal steam passage34 extending up in the post and is -further provided with steam ports 35and 36, that form passages from the said valve chamber to the abovementioned steam chamber 7 in Vwhich the lower extension ofthe post ispositioned. A valve 38 is provided with a stem 37 that extends outthrough a hole in a closure cap 39 in the lower end of the extension,and upon the lower end of this stem is formed a head'40 against whichthe upper y end 41 of the expandable thermostat 42 operates. The lowerend of this thermostat may be supported at 43 upon a hanger'44 as shownin Figs. 1 and 2 or upon the bottom portion ed on the outside of thesteam chamber, which I will now describe. Y

Upon the arm 26 of the bracket 25 is mountedA a link 45` to whichv anadjustablelever 46 is pivotally connected, theirrtermediate portionofsaid lever being also pivotally.

'connected as at 47 to the above, mentioned tubular post 28. 'The outerend portion of the lever is bifurcated to receive a rack 48, the Iflower end of which is pivotallyv connected to the arm 27l ofthe bracket25 before mentioned. The upper end portion of this rack is curved tobetter permit the lever to be ad-v justed thereon@ A spring 49 issecured to and positioned agalnst the inner edge ofthe rack and extendsthrough the arm in a wayV to forma friction suiiicient to hold the leverin an adjusted position. A pinion 50 `is rotatably positioned in theouter end portion of the lever in a way to engage the teeth of the outeredge of athe rack. A handle 51 islconnected to the shaft upon which thepinion is mounted for the purpose of rotating the pinion and to move thelever with respect to the rack. A pointer v52 is secured to the leverand is designed to be read in connection with the graduations 53 uponthe face'k of the rack, which indicates the position at which the levermust be set to cause the pilot valve to operate at a certain degree ofheat as indi-y cated upon the face of the rack by said graduations. y

Figs. 3 and `41Ihave shownmy auxiliary valvemechanism as well as thethermostat for operating the same mounted upon a special form of steamchamber 54 which in practice would be connected by a pipe 56 with themain steam chamber 7. This special steam chamber 54'is designed to housethe thermostat for operating the valve when it would not be practical toposition the thermostat directly in the main heating chamber.' Thischamber may be constructed in any preferred manner and likewiseconnected to any suitable part of the casing of the main steam chamber.This special steam chamber 56 being connected by a large opening withthe main steam chamber, is designed to be heated to the same degree asthe main chamber, and the thermostat is thus equally susceptible to anychange in temperature contained therein.

In the formV of construction shown in Figs. 3 and 4 it will be notedthat the sleeve 22a is formed integral with the cover 23a of the specialsteam chamber and that the bracket 25 is mounted upon the sleeve andpositioned upon the cover 23a.

From the foregoing it will be seen that the operation of the device isas follows. The steam passes through the intake pipe 6 when the mainvalve 9 is open, which fills and heats the chamber 7 causing thethermostat to expand to engage and raise the valve stem and valve toclose the passage 34. This causes the main steam pressure to build up inthe chamber 17, through the port 19, in a manner to operate thediaphragm and close the main valve 9, and cut o the supply to theheating chamber. On the other hand, when the temperature in the heatingchamber drops suiciently, the thermostat will contract and open the port34 in a manner to relieve the pressure in the chamber 17 and to permitthe normal greater pressure on the underside of the diaphragm to againopen the main valve.

Having thus described my invention, what I claim and desire to Secure byLetters Patent, is, j

1. In a thermostatic control device, the combination with a heatingchamber and ay supply pipe, of an inlet valve therefor having afluid-pressure-actuated diaphragm, of a thermostatically operated pilotvalve located at a distance from said inlet valve and extending into theheating chamber, a thermostat within the heating chamber for directlyoperating the pilot valve b vthe rise and fall of temperature in theheating chamber, and a conduit connecting the fluid-pressure-actuateddiaphragm of the inlet valve to the supply connection of the pilotvalve.

2. In a thermostatic control device, the combination with a heatingchamber and a supply pipe connected therewith, of an inlet valve in thesupply pipe having a presvalve, a thermostat contained within the.

heatin chamber for direct engagement with the piIot valve to open thesame for controlling the passage of fluid through the inlet valve and tothe heating chamber, and means for adjusting the pilot valve withrespect to the thermostat.

3. In a thermostatic control device', thecombination with a. heatingchamber and a supply pipe connected therewith, of an inlet valve havinga diaphragm for operating the same by the initial fluid pressureandincluding la pressure chamber on each side of the diaphragm, a smallport in the valve a stem connecting the pressure chamber on the top sideofl the diaphragm with the under or live steam vside, a thermostaticallyoperated pilot valve located at a distant point from the inlet valve andextending into the heating chamber, a conduit connecting the controlchamber above the diaphragm with thev pilot valve, a thermostatcontained within the heating chamber directly engage the pilot valve forcontrolling the passage of liuidthrough the inlet valve and to theheating chamber, and adjustable means for determining the time forthepilot valve tc operate.

4. In a thermostatic control device, the combination with aheating'chamber and a supply pipe connected therewith, of an inletvvalvehaving a diaphragm for operating the same by the initial fluid pressureand including a pressure chamber on each side of the diaphragm, a smallport connecting the chambers on the opposite sides of the diaphragm, asleeve secured to the wall of the heating chamber, a tubular postadjustably mounted in the sleeve, a pilot valve mounted in the tubularpost and adapted to control the passage of fluid through the post and toand from the heating chamber, a vconduit connecting the chamber abovethe diaphragm withl the tubular post and pilot valve, a thermostatcontained within the heating chamber to open and close the pilot ivalve, and adjustable means for determining the time for operating thepilot valve. `Signed at Bridgeport, in the county of Fairfield and Stateof Connecticut, this 29th dayy of September, A. D., 1919.

' GEORGE W. COLLIN. Witnesses:

JOSEPH L. PARRAGA, LILLIAN M. ALLING,

